Resuming backups on a cloned drive

I recently had the hard drive in my iMac upgraded to a much larger one because I was too close to filling up the hard drive. I cloned my entire internal hard drive to the larger drive using SuperDuper! and swapped the new, bigger drive into the iMac for the old, smaller drive.
Now Time Machine is telling me I don't have enough space to back up because it appears that it's trying to put an entirely new backup from scratch on the Time Machine disk along with the previous backup of the smaller original internal hard drive. The cloned disk now has only a few small files added to it since the installation, so it should just be an incremental backup. The cloned drive is named exactly as the old one was, and it was a full clone backup of the original internal drive. Time Machine seems to be seeing it as a different Mac.
Do I have to start over with a brand new backup now? Is there any way of getting TM to recognize the cloned drive as the same as the original drive?
Thanks.

the new hard drive has a different UUID than the old drive and TM tags backups of various drives by their UUIDs. the only way to make TM resume incremental backups instead of making a full new backup is via a terminal hack described here
http://www.macosxhints.com/article.php?story=20090213071015789
you need to be somewhat proficient with terminal to follow the instructions.

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